Perl scripts

Hi,

I'm trying to use the embedded perl interpreter in wackamole to reconfigure 
my services when an VIF comes up. I want to start an instance of Exim smtp 
server listening on port 25 on the newly acquired IP address, but only for 
certain addresses.

I've managed to get a perl function logging to syslog, but I don't see how 
to work out what the new IP address is. Does the perl function get called 
with any parameters? Is there a way to do that? If not, is there another 
way of deciding which interfaces just came up?

I'm using MacOSX 10.4 with this config:

# Named socket for online control
Control = /var/run/wack.it
PerlUseLib /opt/local/etc/
PerlUse wackamole
RunDynamic wackamole::mysub on up

mysub just prints a string to syslog. I tried to capture arguments passed 
to mysub by dumping $_ into the string, but couldn't make any sense of the 
output. That could be my perl ignorance, though.
-- 
Ian Eiloart
IT Services, University of Sussex